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Residents press for ultrafine‑particle monitoring and limits on larger aircraft during airport debate
Summary
During the April 28 public hearing, residents, doctors and an invited expert urged commissioners to require measured data on ultrafine particles and clearer noise management before approving the modernization package; applicants said year‑long monitoring has begun but asked for time to collect a baseline.
Residents and health‑concerned commenters dominated public testimony at the April 28 hearing, pressing the county to require measured air‑quality results — including ultrafine‑particle metrics — before allowing broad modernization approvals that could enable larger aircraft and more vehicle traffic.
Multiple speakers cited the potential public‑health consequences of ultrafine particles from jet engines and urged the commission not to rely only on project modeling. ‘‘We simply cannot go forward until we know what people are breathing,’’ Ellen Anderson told the panel. A written submission read into the record by Barbara Conisor on behalf of Amory (Lovins) called for explicitly measured ultrafine metrics and said the county’s monitoring contract excluded those particles.
The applicant’s technical team said they have installed monitoring equipment across the valley: Diane Jackson explained that two high‑quality reference stations were placed at the runway ends in January 2026, supplemented by distributed, solar‑powered screening monitors; a primary reference unit came online April 7. Jackson said the team intends to collect 12 months of data so the community has a year‑long baseline that captures seasonal patterns and the scheduled short runway closure this summer.
Many residents argued that measurement — not modeling alone — is required to assess long‑term neighborhood exposures and to evaluate claims that new aircraft types would lower per‑passenger emissions. ‘‘The county refuses to measure these particles,’’ the Amory Love/Lovins submission said (read into the record); commissioners asked staff to document precisely which metrics the monitoring program will produce and to consider adding ultrafine‑particle monitoring if it is not already included.
Commissioner Joe Mason summarized neighborhood concerns, pointing to Woody Creek and Brush Creek as local flight‑track downwind receptors and urging stronger noise and air‑quality commitments before the BOCC takes the next step. Applicants and several pilot/AAB speakers countered that the voluntary Fly With Integrity program and the monitoring network are intended to produce actionable data and to drive pilot outreach and voluntary operational changes.
What comes next: the commission’s non‑conformance finding requires staff to draft a resolution for the BOCC that documents PNZ’s requested follow‑ups, including (at minimum) a year‑long, documented baseline monitoring plan with explicit metrics, quarterly reporting, and stronger evidence that parking/transportation plans will prioritize alternative modes to avoid increasing vehicle trips.
